The Globular Cluster M54 and the Star Formation History of the Sagittarius Dwarf Galaxy | Zendy

Andrew C. Layden | Zendy; Ata Sarajedini | Zendy

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The Globular Cluster M54 and the Star Formation History of the Sagittarius Dwarf Galaxy

Author(s) -

Andrew C. Layden,

Ata Sarajedini

Publication year - 1997

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/310848

Subject(s) - sagittarius , globular cluster , physics , astrophysics , star cluster , dwarf galaxy , astronomy , dwarf spheroidal galaxy , galaxy , cluster (spacecraft) , population , interacting galaxy , demography , sociology , computer science , programming language

We present a deep color-magnitude diagram in the VI passbands of the globular cluster M54, a member of the Sagittarius dwarf galaxy. The data extend below the cluster's main sequence turn-off, allowing us to estimate the cluster's age. We find that M54 is 0.5--1.5 gigayears older than the Galactic globulars M68 and M5. In absolute terms, the age is comparable to the published age estimates of the other member clusters Arp 2 and Terzan 8, but is significantly older than the member cluster Terzan 7. An age estimate of the Sagittarius field population relative to M54 suggests that M54 is \gtrsim 3 Gyr older than the field. We discuss briefly the star formation history of the Sagittarius dwarf galaxy

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